According to HP, the potential threat exists on HP 5400 zl series switches purchased after April 30, 2011 with certain serial numbers listed in the security advisory.

This issue once again brings attention to the security of the electronics supply chain which has been a hot topic as of late. In March 2012, a consortium of experts published a preview of standards meant to improve the security of the global supply chain for commercial software and hardware products. The standards are the work of The Open Group, and are supported by companies ranging from Boeing to Oracle to IBM.Link to Original Source